The fuse offers per device protection, as well as per room/area.
E.g. you have a lamp that draws 1A. It’s cable is rated for 3A. It has a malfunction and starts drawing 10A. This won’t pop a breaker, but will overload the cable. Eventually it could catch fire from overheating. If it has a 3A slow blow fuse, it will kill the fuse before it kills the cable.
It also helps to isolate problems rapidly to 1 device.
The ring main was the impetus for it. However it allows for safe down rating at the plug. My lamps don’t need 13A flex. If the only safety system is a 13A breaker, then you’re stuck with it, or risking a cable overload
The fuse offers per device protection, as well as per room/area.
E.g. you have a lamp that draws 1A. It’s cable is rated for 3A. It has a malfunction and starts drawing 10A. This won’t pop a breaker, but will overload the cable. Eventually it could catch fire from overheating. If it has a 3A slow blow fuse, it will kill the fuse before it kills the cable.
It also helps to isolate problems rapidly to 1 device.
yeah but the only reason it happened was because you use ring mains.
aint’ nothing going to convince me that shit belongs in the 21st century.
The ring main was the impetus for it. However it allows for safe down rating at the plug. My lamps don’t need 13A flex. If the only safety system is a 13A breaker, then you’re stuck with it, or risking a cable overload